General Safety Information

CABIN HEATER

NOTE: The Cabin Heater, also known as the Diesel Cabin Heater Assist (DCHA), will be referred to as the DCHA throughout most of the General Information and the Diagnostic Procedures.

GENERAL SAFETY INFORMATION

WARNING:
- DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH AS A GARAGE THAT DOES NOT HAVE EXHAUST VENTILATION FACILITIES. ALWAYS VENT THE DCHA's EXHAUST WHEN OPERATING THE DCHA. REFER TO VENTING THE DCHA'S EXHAUST FOR PROPER EXHAUST VENTING INSTRUCTIONS. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY OR DEATH.
- ALLOW THE DCHA ASSEMBLY TO COOL BEFORE PERFORMING A COMPONENT INSPECTION/REPAIR/REPLACEMENT. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
- ALWAYS DISCONNECT THE VEHICLE'S BATTERY PRIOR TO PERFORMING ANY TYPE OF WORK ON THE DCHA. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY OR DEATH.
- NEVER ATTEMPT TO REPAIR THE DCHA HEATER MODULE OR ANY OF ITS INTERNAL COMPONENTS. ALWAYS PERFORM DCHA COMPONENT REPLACEMENT IN ACCORDANCE WITH THE SERVICE INFORMATION. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY OR DEATH.

CAUTION:
- Do not actuate the DCHA Field Mode Test with the engine oft. Failure to follow these instructions may result in internal damage to the DCHA Heater Module.
- Always Perform The Cabin Heater Pre-Test Prior To Performing Any Other Cabin Heater Test For The Test Result To Be Valid.

NOTE:
- Do not disconnect the vehicle's battery or the DCHA's main power-supply while the DCHA is in operation or in run-down mode. Failure to follow these instructions may result in excess emissions from the DCHA Heater Module.
- Failure to prime the Dosing Pump after draining the DCHA fuel line will prevent DCHA heater activation during the first attempt to start the heater. This will also set a Diagnostic Trouble Code (DTC) in the DCHA Control's memory. Do not perform the Dosing Pump Priming Procedure if an attempt was made to start the DCHA without priming the Dosing Pump first. This will put excess fuel in the DCHA Heater Module and cause smoke to emit from the DCHA exhaust pipe when heater activation occurs.
- Waxed fuel can obstruct the fuel line and reduce flow. Check for the appropriate winter grade fuel and replace as necessary.